The three-flavor QCD phase diagram at finite isospin and strangeness chemical potentials acquires a theta-dependence with a novel parity-preserving superfluid phase at theta = pi and no Dashen transition inside the superfluid phases.
$\theta$-dependence of QCD at Finite Isospin Density
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abstract
We probe the $\theta$-dependence of QCD at finite isospin chemical potential $\mu_I$ using the effective chiral Lagrangian approach. The phase diagram in the $\theta$, $\mu_I$ plane is constructed and described in detail in terms of chiral and pion condensates. The physics at $\theta ~ \pi$ is investigated in both the normal and superfluid phase. Finally, the behaviour of the gluon condensate at finite $\mu_I$ is computed.
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On the $\theta$-angle physics of QCD under pressure: The strange and isospin phase diagram
The three-flavor QCD phase diagram at finite isospin and strangeness chemical potentials acquires a theta-dependence with a novel parity-preserving superfluid phase at theta = pi and no Dashen transition inside the superfluid phases.